直接甲醇燃料電池為一直接將化學能轉換成電能的一種發電系統，因其潔淨、高效率，在發展上有很大的潛力。碳擔體在燃料電池中扮演重要的腳色，關係著觸媒的分散效果、電池的導電性及觸媒的活性。本研究主要利用不同形態及不同表面處理的碳材作為觸媒擔體做一系列的研究，並以PTFE摻入電池氣體擴散層觀察親疏水性對電池的影響。本研究利用三極式系統對電池進行放電性能測試，以陰陽兩極的極化曲線作個別的分析，並與半電池系統的結果互相比較。
　　研究發現7.43 wt% PTFE處理的碳紙具有最佳的單電池放電性能。經過鹽酸處理的碳擔體，可能因為具有較高的親水性，可有效的提升陽極效能；而經過硝酸處理的碳擔體，可能因其親水性高，半電池雖有很高的陽極電化學活性，但會使甲醇滲透現象加劇，且因其金屬微粒接近3 nm，適於陰極氧氣的還原，因而用於陰極而不使用於陽極，能使單電池最大功率密度提昇33%。
　　在中孔洞碳擔體製備的觸媒中，高比表面積的MC2具有最高的單電池效能，其電池效能略優於碳黑製備的觸媒，且在半電池系統具有較負的陽極氧化起始電位，活性較高。實心狀中孔碳雖然半電池具有最高的活性，但可能因熱壓遮蓋部分孔洞及觸媒，使得單電池效能不好。在碳材表面成長奈米碳管的海膽狀碳材製備的觸媒，能有效的降低電池的電阻，增進電池的效能。

Direct methanol fuel cell (DMFC) was a type of power generating system that can directly transfer chemical energy to electrical energy. It has a potential to developing a power generating system because it was clean and effective. In DMFC system, carbon support played an important role in the distribution of metal grains, conductivity of fuel cell, and activity of catalysts. The aims of this research was focused on the effects of morphology, surface treatment of carbon supports, and hydrophilic/hydrophobic behavior of gas diffusion layer. The letter was studied by PTFE treatment. Three-electrodes system was applied to analyze anode and cathode. The results of the three-electrodes system were compared with the results from half cell system.
In the study, the carbon paper treated by 7.43 wt% of PTFE showed the best performance for anode gas diffusion layer. Carbon supports treated by HCl showed good performance for anode catalyst probably because of the increase of hydrophilicity. Carbon supports treated by HNO3 also had high hydrophilicity and electrochemical activity for methanol oxidation in half cell system, but it was not good for anode catalyst in fuel cell because of serious crossover of methanol. The results also showed that catalysts on HNO3-treated carbon supports were suitable for the reduction of oxygen because the size of metal grains was near 3nm. As a result, the maximum power density of HNO3-treated carbon supports was 33% larger than that of non-treated carbon supports.
In the study of mesoporous carbons, MC2, had the best cell performance with the highest specific surface area. Because of very negative onset potential for methanol oxidation, MC2 showed better cell performance and electrochemical activity than carbon black. The solid ball type of mesoporous carbon had higher electrochemical activity than other mesoporous carbon in half cell system. However, its cell performance was bad probably because the part of the pores were broken during hot pressing. Urchin like carbon, which was fabricated by growing carbon nanotube on the surface of mesoporous carbon, showed higher cell performance than mesoporous carbon before carbon nanotube growth because of higher electric conductivity than other types of carbon supports.

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